Hot desking device ordering

I am trying to update the phone number of an existing “Unify Office for Desktop” device with a phone number from the inventory with the following code and it gives me:

"errorCode" : "ORD-104",

"message" : "Hot desking device ordering is not available for current account"

$body = array(

'phoneLines' => array(

array(

'id' => '687039071'

)

)

);

$r = $platform->put("/restapi/v1.0/account/~/device/1519215071", $body);

Best regards,

Peter